REDRUM4YOUI have the larger one and I absolutely love it. Keeps coffee hot all day and keeps cold drinks even longer. I've left ice in it for over 48 hours and there were still cubes in it...
REDRUM4YOUMEH...the non-stick coating sucks...it should just be Stainless IMO. It is just a mug with a lid; you need to remove the lid to drink/pour. Does not go so well in the car.
MotorradThe larger version has a little button you press and the cap pops up for you to drink out of. I think you should check out that version if you want to use it while driving.